Improvement in chucks



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Chuck.

Patented July 10, 1866.

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UNITED STATES.

PATENT OFFICE;O

ISAAC SMITH, OF NEW YORK, N. Y., ASSIGNOR TO HIMSELF AND WM. H. HAIGHT, OF SAME PLACE.

IMPROVEMENT IN CHUCKS.

Specification forming part of Letters Patent No. 56,330, dated July l0, 1866.

To all 'whom it may concern:

Beit known that I, ISAAC SMITH, of the city, county, and State of New York, have invented certain new and useful Improvements in Chucks; and I do hereby declare that the following' is a full, clear, and exact description of the same, reference being had to the accompanying drawings, forming part of this specitication, in which- Figure l is a central longitudinal section of achuckconstructed according to my invention. Fig. 2 is an end view of the same, with the annular plate that covers the forward end removed.'

Similar letters of reference indicate correspondin g parts in both figures.

This invention relates to that class of chucks which are employed for concentrically holding drills or other tools with shanks of different sizes, and for holding wires or rods during the operation of turning the same; and it consists in a novel combination of a screw, inclined planes, and levers for operating the dogs of the chuck, whereby a very powerful griping action is exerted upon the article held therein.

The invention further consists in a novel arrangement of parts, whereby' the chuck is rendered very strong and compact, and whereby the most efcient operation of the said screw, inclined planes, and levers is effectual] y obtained.

To enable others skilled in the art to understand the construction and operation of my invention, I will proceed to describe it with reference to the drawings. y

A represents the tubular body ofthe chuck, upon the frontor forward end of which is formed a rim or flange, a, and in the front surface of this flange a are formed three recesses, b, which radiate from the center or axis of the body A and are covered by an annular plate, c, which is securely fastened by screws, rivets, or other suitable means to the front surface of the said flange a, so that the recesses just mentioned constitute radiating slots, which extend from the interior of the body A to the exterior surface of the flange a, and in which are placed the sliding griping or holding dogs B.

Formed upon the flange immediately in rear of each dog B is a suitable bearing, d, in which is pivoted alever, I, the foremost end of which is rounded, as shown at g, and is placed in a slot, e, formed transversely in the outer end of the dog B in such manner that when the rearmost ends ofthe said levers d are moved outward they will move the sliding dogs B inward toward the center or axis of the tubular body A, as will be hereinafter more fully set forth. The outer surface of the rearmost end of the body A is provided with a screw-thread, as at H.

C represents a collar, the interior of which constitutes a female screw, which is screwed upon the threaded rearmost portion, H, of the body A, as shown in Fig. l. The forward part, c', of this collar C is cylindrical, and of less circumference than the rear port-ion thereof, and has a groove, n, formed concen trically upon and around its circumference. body A, in front of this collar C, is a sliding collar, D, the rear portion of which is placed over and upon the forward part, z', of the collar C, and is attached thereto by means of ashort pin or screw, r, which passes through one side of the collar D, with its inner end situated in the groove n.

The sliding collar O is prevented from turning around upon the body A by means of a small longitudinal rib or feather, m, which works in a longitudinal groove in the inner circumference of the said collar C.

Formed upon the outer circumference of the collar O, and in contact with the rearmost ends of the levers I, are three inclined planes, E, which slope forward and inward, as shown in Fig. 1, in such manner that when they are moved forward they will force the rearmost ends of the levers I outward, to slide the dogs D toward the center or axis of the body A to grasp the drill or other article, and when moved backward will allow the said dogs to recede from such axis to allow the drill or other article to be removed from the chuck.

F is a short cylindrical block, which has a deep conical cavity or recess, u, in its forward end. This block F is placed within the body A, to center the rearmost end of thedrill or other comparatively short article held in the chuck, but may be taken out when it is desired to pass a rod or other similar article entirely through the body A in holding it to be turned.

The drill, rod, or other article which it is desired to hold in the chuck is inserted to the re- Placed upon the quired distance into the forward end of the tubular body A,and the collarCis then turned or rotated in such amanner as to move forward upon the threaded rearrnost portion, H, of the said body, thus forcing the inclined planes E forward underneath the rearmost or longarms of thelevers I and forcing them outward, so that the .levers I slide the dogs B inward to clasp the drill or other article between thein with a very powerful griping or holding action, While by turning the collar C in the opposite direction it is caused to move backward toward the rearniost end of the body A, and, drawing,` back the sliding,` collar D with it, moves the inclined planes E back under the rearmost arms of the levers I, thus allowing the said arms to move inward and bring the sliding dogs B outward and release the drill or other article from their grasp.

By making the sliding collar D sufficiently conical in form the same result will be accomplished as when the inclined planes E are made to project beyond the circumference of the said collar.

What I claim as new, and desire to secure by Letters Patent, is-

l. The combination of the screw-collar G, sliding collar D,inc1ined planes E, and levers I, substantially as herein set forth, for the pur- 

